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Allfunandgaymes t1_j0zh3j9 wrote

None. Wavelengths of alpha, beta, and gamma radiation are outside of the visible spectrum and thus produce no visible glow of their own.

A radioactive substance can glow if it's so radioactive it generates enough heat - known as decay heat or heat of decay - to excite atoms to give off infrared / red light, like a hot stovetop. That is the sort of radioactivity that would scramble your DNA like eggs if you got anywhere near it, though.

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